﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

class BookSale
{
    public string Isbn { get; set; }
    public int Amount { get; set; }
    public decimal Income { get; set; }

    public BookSale()
    {
        Isbn = "";
        Amount = 0;
        Income = 0m;
    }
}
